RHEL 9 must terminate idle user sessions.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-258077	RHEL-09-412080	SV-258077r926218_rule		Medium

Description
Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended.

STIG	Date
Red Hat Enterprise Linux 9 Security Technical Implementation Guide	2023-12-01

Details

Check Text ( C-61818r926216_chk )
Verify that RHEL 9 logs out sessions that are idle for 15 minutes with the following command: $ sudo grep -i ^StopIdleSessionSec /etc/systemd/logind.conf StopIdleSessionSec=900 If "StopIdleSessionSec" is not configured to "900" seconds, this is a finding.

Fix Text (F-61742r926217_fix)
Configure RHEL 9 to log out idle sessions by editing the /etc/systemd/logind.conf file with the following line: StopIdleSessionSec=900 The "logind" service must be restarted for the changes to take effect. To restart the "logind" service, run the following command: $ sudo systemctl restart systemd-logind Note: To preserve running user programs such as tmux, uncomment and/or edit "KillUserProccesses=no" in "/etc/systemd/logind.conf".

Fix Text (F-61742r926217_fix)

Configure RHEL 9 to log out idle sessions by editing the /etc/systemd/logind.conf file with the following line:

StopIdleSessionSec=900

The "logind" service must be restarted for the changes to take effect. To restart the "logind" service, run the following command:

$ sudo systemctl restart systemd-logind

Note: To preserve running user programs such as tmux, uncomment and/or edit "KillUserProccesses=no" in "/etc/systemd/logind.conf".